104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/*
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em28xx-vbi.c - VBI driver for em28xx
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Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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This work was sponsored by EyeMagnet Limited.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include "em28xx.h"
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#include "em28xx-v4l.h"
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/* ------------------------------------------------------------------ */
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static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
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unsigned int *nbuffers, unsigned int *nplanes,
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unsigned int sizes[], void *alloc_ctxs[])
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{
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struct em28xx *dev = vb2_get_drv_priv(vq);
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struct em28xx_v4l2 *v4l2 = dev->v4l2;
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unsigned long size;
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if (fmt)
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size = fmt->fmt.pix.sizeimage;
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else
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size = v4l2->vbi_width * v4l2->vbi_height * 2;
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if (0 == *nbuffers)
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*nbuffers = 32;
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if (*nbuffers < 2)
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*nbuffers = 2;
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if (*nbuffers > 32)
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*nbuffers = 32;
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*nplanes = 1;
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sizes[0] = size;
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return 0;
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}
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static int vbi_buffer_prepare(struct vb2_buffer *vb)
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{
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struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
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struct em28xx_v4l2 *v4l2 = dev->v4l2;
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struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
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unsigned long size;
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size = v4l2->vbi_width * v4l2->vbi_height * 2;
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if (vb2_plane_size(vb, 0) < size) {
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printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
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__func__, vb2_plane_size(vb, 0), size);
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return -EINVAL;
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}
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vb2_set_plane_payload(&buf->vb, 0, size);
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return 0;
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}
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static void
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vbi_buffer_queue(struct vb2_buffer *vb)
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{
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struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
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struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
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struct em28xx_dmaqueue *vbiq = &dev->vbiq;
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unsigned long flags = 0;
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buf->mem = vb2_plane_vaddr(vb, 0);
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buf->length = vb2_plane_size(vb, 0);
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spin_lock_irqsave(&dev->slock, flags);
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list_add_tail(&buf->list, &vbiq->active);
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spin_unlock_irqrestore(&dev->slock, flags);
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}
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struct vb2_ops em28xx_vbi_qops = {
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.queue_setup = vbi_queue_setup,
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.buf_prepare = vbi_buffer_prepare,
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.buf_queue = vbi_buffer_queue,
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.start_streaming = em28xx_start_analog_streaming,
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.stop_streaming = em28xx_stop_vbi_streaming,
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.wait_prepare = vb2_ops_wait_prepare,
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.wait_finish = vb2_ops_wait_finish,
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};
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